How overlap UV of repeating faces
Select all the faces and press u for unwrap and press reset, so all will be squares (Enable stretch in right properties in uv editor for better seeing). Now select the faces you want to repeat then enable uv and mesh sync in uv editor. Now select faces in 3d view then scale down in uv editor and move aside, similarly, repeat manually (press two adjacent faces and press shift+cltr+(numpad +) to grow selection based on previous selection). Finally press A to select all and cltr+a to average all islands. using box select b select group of islands move them where you needed. I hope this helps.